Learn to DJ with real-time feedback on your actual controller.
Interactive lessons that watch your moves, score your mixing, and build your skills — right in the browser. No downloads. No $150 classes.
Free forever for core features. No credit card.
Learning to DJ is stuck in 2010
YouTube tutorials
Passive watching with zero feedback. You never know if you're actually hitting the phrase or drifting off-beat.
DJ schools
High barriers to entry with $50-$150/hr rates. Inaccessible for most beginners just starting their journey.
Pro DJ software
Built for professional performance in a club, not for teaching technical fundamentals to a novice.
How onset works
Watch
See the technique demonstrated with interactive overlays showing exactly where faders and knobs should be.
Imagine
Mental rehearsal through our guided visualizer before you touch the decks. Lock in the structure of the track.
Do it
Your turn. We track your MIDI signals in real-time, scoring you on accuracy, timing, and phrase alignment.
Real-time scoring
Every nudge of the jog wheel and every EQ swap is analyzed against the target transition with millisecond precision.
MIDI controller support
Plug and play with any modern DJ controller. No extra software needed — it works directly through WebMIDI.
Adaptive difficulty
Onset learns your weak points and suggests custom exercises to tighten your beatmatching and phrasing.
XP and streaks
Gamified progress tracking keeps you on the decks every day. Level up your DJ rank as you master new genres.
See it in action
Frequently Asked Questions
Do I need a DJ controller?
Not yet. You can use mouse and keyboard for basic lessons. But a controller like the Hercules Inpulse 200 MK2 (~$100) makes it 10x better. We're also building a phone-as-controller feature.
What music can I practice with?
Any audio files you own — MP3, WAV, OGG, FLAC. Drag them onto a deck and go. Onset auto-detects BPM and generates a beat grid.
Is it free?
Core features are free forever. No credit card, no trial period. We'll offer premium lessons and analytics later, but the fundamentals stay free.
What browsers work?
Chrome, Edge, and Firefox on desktop (1200px+ screen). Web Audio and Web MIDI APIs are required. Safari has limited MIDI support.
Ready to learn?
No spam. Just launch updates.